<?php
/**
 * Http 响应
 * */
namespace socket;

class HttpResponse
{

    /**
     * Http 状态码对应的字符串说明
     * */
    const HTTP_RESPONSE_STRING = [
        100 => 'Continue',
        101 => 'Switching Protocol',
        200 => 'OK',
        201 => 'Created',
        202 => 'Accepted',
        203 => 'Non-Authoritative Information',
        204 => 'No Content',
        205 => 'Reset Content',
        206 => 'Partial Content',
        300 => 'Multiple Choices',
        301 => 'Moved Permanently',
        302 => 'Found',
        303 => 'See Other',
        304 => 'Not Modified',
        307 => 'Temporary Redirect',
        308 => 'Permanent Redirect',
        400 => 'Bad Request',
        401 => 'Unauthorized',
        403 => 'Forbidden',
        404 => 'Not Found',
        405 => 'Method Not Allowed',
        406 => 'Not Acceptable',
        407 => 'Proxy Authentication Required',
        408 => 'Request Timeout',
        409 => 'Conflict',
        410 => 'Gone',
        411 => 'Length Required',
        412 => 'Precondition Failed',
        413 => 'Payload Too Large',
        414 => 'URI Too Long',
        415 => 'Unsupported Media Type',
        416 => 'Range Not Satisfiable',
        417 => 'Expectation Failed',
        418 => 'I\'m a teapot',
        422 => 'Unprocessable Entity',
        425 => 'Too Early',
        426 => 'Upgrade Required',
        428 => 'Precondition Required',
        429 => 'Too Many Requests',
        431 => 'Request Header Fields Too Large',
        451 => 'Unavailable For Legal Reasons',
        500 => 'Internal Server Error',
        501 => 'Not Implemented',
        502 => 'Bad Gateway',
        503 => 'Service Unavailable',
        504 => 'Gateway Timeout',
        505 => 'HTTP Version Not Supported',
        511 => 'Network Authentication Required',
    ];

    /**
     * 请求体过大响应
     * @param   resource    $conn
     * */
    public static function entityTooLarge($conn) {
        self::writeHttpResponse($conn, 413);
    }

    /**
     * 返回 404
     * @param   resource    $conn
     * */
    public static function notFound($conn) {
        self::writeHttpResponse($conn, 404);
    }

    /**
     * 响应客户端
     * @param   resource    $conn
     * @param   integer     $code
     * @param   string      $body
     * @param   string      $httpVersion
     * @param   array       $headers
     * */
    public static function writeHttpResponse($conn, $code,  $body = '', $httpVersion = '1.1', $headers = ['Server' => 'php socket']) {
        $responseHeader = [];
        foreach ($headers as $idx => $item){
            array_push($responseHeader, sprintf("%s: %s", $idx, $item));
        }
        $response = sprintf("HTTP/%s %d %s\n%s\r\n\r\n%s", $httpVersion, $code, self::HTTP_RESPONSE_STRING[$code], implode("\n", $responseHeader), $body);
        socket_write($conn, $response);
    }
}
